The principal elements in behavioral thermoregulation are basking (heliothermy),heat exchange with substrates such as rock or earth (thigmothermy)，and diurnal and annual avoidance behaviors,which include moving to shelter during the day for cooling and hibernating or estivating (reducing activity during cold or hot weather, respectively).( TPO40,48)
bask /bɑ?sk/ v. 坐着或躺着取暖
substrate /'s?bstre?t/ n. 底物，基片，基质;被(酶)作用物
diurnal /da?'??n(?)l/ adj. 白天的，白昼的;每日的
hibernate /'ha?b?ne?t/ v. 冬眠
estivate /'i?st?ve?t/ v. (动物)夏眠
respectively adv. 各自地
分析：
修饰一：(in behavioral thermoregulation) ，介词短语
中文：行为温度调节
修饰二：(with substrates such as rock or earth (thigmothermy) ) ，介词短语
中文：与基质如岩石或土壤进行热交换(接触热源)
修饰三：(which include moving to shelter during the day for cooling and hibernating or estivating) ，从句
中文：这包括转移到遮蔽处去乘凉、冬眠或夏眠
修饰四：(reducing activity during cold or hot weather, respectively) ，非谓语动词
中文：分别在寒冷或炎热的天气减少活动
参考翻译：
行为温度调节主要的要素有：晒太阳(日光浴)，与基质如岩石或土壤进行热交换(接触热源)，以及每天或每年的躲避行为，这包括转移到遮蔽处去乘凉、冬眠或夏眠(分别在寒冷或炎热的天气减少活动)。